More than one-third of American adults are classified as obese, with a (BMI) exceeding 30. BMI is a measurement based on height and weight. About 160,000 weight-loss surgeries are performed each year in the United States, according to the American Society for Metabolic and Bariatric Surgery. Several different surgical procedures exist, but all seek to reduce the capacity of the stomach, which allows fewer calories to be consumed and/or absorbed.
Obesity is a known risk factor for atrial fibrillation, which can trigger stroke and other dangerous problems when the top chambers of the heart, called the atria, quiver erratically — sometimes faster than 300 times per minute.
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